根据《麻醉药品和精神药品管理条例》,药品经营企业对第二类精神药品专用账册的保存期限为()。
A.3年
B.1年
C.不少于5年
D.药品有效期满之日起不少于5年
参考答案:D
_______, her hands shook constantly and violently.
A.Knowing her son killed in the mine
B.When she knew her son was killed in the mine
C.Known her son killed in the mine
D.She knew her son killed in the mine
反馈电路分为()。
A.数字式和模拟式;
B.正反馈和负反馈;
C.直流反馈和交流反馈;
D.电感式和电容式。